Nuclear quadrupole resonance studies of amorphous, orthorhombic, and rhombohedral arsenic

Journal Article · Wed Oct 15 00:00:00 EDT 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.22.3903· OSTI ID:5012500

Jellison, Jr, G E; Petersen, G L; Taylor, P C

Pulsed nuclear quadrupole resonance (NQR) experiments have been performed on three forms of elemental arsenic: amorphous (a), rhombohedral (rh), and orthorhombic (or). The temperature dependence of the spin-lattice relaxation time (T/sub 1/) provides evidence for the existence of disorder (tunneling) modes in a-As. It is found that the NQR line shape of a-As is highly asymmetric, and this asymmetry is attributed to a distribution of dihedral angles in a-As. The observed NQR frequencies indicate that the amount of bonding s admixture is different in each material (rh-As:3%, or-As:7%, a-As:10%). Simple calculations in comparison with x-ray results indicate that the bonding configurations in these three forms of arsenic do not necessarily correspond to maximum overlap of bonding orbitals on adjacent atoms.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5012500
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Vol. 22:8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARSENIC
CRYSTAL-PHASE TRANSFORMATIONS
AMORPHOUS STATE
BINDING ENERGY
BOND LENGTHS
CRYSTAL STRUCTURE
NUCLEAR QUADRUPOLE RESONANCE
ORDER-DISORDER TRANSFORMATIONS
ORTHORHOMBIC LATTICES
TUNNEL EFFECT
VIBRATIONAL STATES
CRYSTAL LATTICES
DIMENSIONS
ELEMENTS
ENERGY
ENERGY LEVELS
EXCITED STATES
LENGTH
PHASE TRANSFORMATIONS
RESONANCE
SEMIMETALS
360602* - Other Materials- Structure & Phase Studies